In the E.L. James novel Fifty Shades of Grey, it's mentioned that Anastasia Steele's birthday is September 10. That milestone was celebrated yesterday by the official Twitter account for the Universal Pictures adaptation, with a new photo of Dakota Johnson as Anastasia Steele.

While the image certainly isn't graphic in nature, it does hint at the steamy romance that will be featured when this highly-anticipated movie hits theaters February 13. Take a look at the official photo below, and stay tuned for more images and footage as we get closer and closer to Fifty Shades of Grey's big screen debut.

The story follows young college student Anastasia Steele (Dakota Johnson) who engages in a torrid affair with 27-year-old billionaire Christian Grey (Jamie Dornan). The novel and its sequels, Fifty Shades Darker and Fifty Shades Freed, have sold over 70 million copies worldwide, and have been translated into over 50 languages.

Sam Taylor-Johnson directs Fifty Shades of Grey, which co-stars Jennifer Ehle, Luke Grimes, Victor Rasuk, Eloise Mumford, Max Martini, Rita Ora and Marcia Gay Harden.